You think the Nevada desert, you think solar power. But that's not the case at Pahrump Valley High School, about 50 miles west of Las Vegas. The school, scheduled to open in 2012, is being built with a geothermal heat pump (GHP).

Net zero energy efficiency at "an unprecedented rate of affordability?" Well, that's what the first private commercial micro-grid project of its kind in California, known as 2500 R Street, promises to deliver.

Milk, cream, proteins, syrups and pieces of fruit - all are are part of the waste stream of ice-cream factories, and soon, at a Ben and Jerry's factory in the Netherlands, they'll all help to produce green power.

In a State of the Union address packed with nods to cleantech, President Obama's call for the United States to become the first nation with one million electric vehicles on the road - and to do it by 2015 - could easily have been heard and then forgotten.

City 2046. Art, life and ingenuity. These were the themes for the ninth annual Michelin Design Challenge, an international automotive design competition for individual designers, teams, studios, and companies.